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Having trouble with insert statement

Hi Guys,
I'm trying to insert records into a table that has a unique auto incrementing number as it's key.

How can I insert a record into this table without interfering with the key?

It's a simple user table with user id (key), username, password.
I just want to insert to username and password and have the unique key incremented without me having to touch it.

Here's the php I've got at the moment:

Code:

//Search through the database to see if the username the user has chosen already exists
if(mysql_num_rows(mysql_query("SELECT username FROM users WHERE username = '$username'"))){
printf("Sorry, the username $username is already taken<br />");
}
else{
printf("Congratulations, the username $username has not been taken yet");
//If the user input passes the filters and tests, then it is inserted into the database
"INSERT INTO users (userid,username,password)
VALUES ('',$safeUsername,$safePassword)";
echo "Record Inserted";
};